#include<stdio.h>
extern int gloab_var;
void global_var_increase(void)
{
    gloab_var ++;
    printf("function1 gloabl is %d\n", gloab_var);
}
void global_var_increase2(void)
{
    gloab_var ++;
    printf("function2 gloabl is %d\n", gloab_var);
}
int gloab_var;
int main(void)
{
    for(;;)
    {
        global_var_increase();
        global_var_increase2();
    }
    return 0;
}